Correcting Teachers

“Wow Professor Smith, you really blew that one. Are you sure you didn’t get a fake Ph.D. online?”

In our Parsha (37:1 and from 31:7 in Ki Sisa) our sages tell us that Betzalel corrected Moshe on an instruction from Hashem !! Betzalel figured it out on his own !!! Yet the Medrash Rabbah, 50:5, says that Betzalel introduced his comment by saying “Our teacher (and master) Moshe…”.